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首页> 外文期刊>Irrigation Science >Soil solution and exchange complex response to repeated wetting–drying with modestly saline–sodic water
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Soil solution and exchange complex response to repeated wetting–drying with modestly saline–sodic water

机译：土壤溶液和交换复合物对用适度盐水-苏打水反复润湿-干燥的反应

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摘要

Coal bed natural gas (CBNG) extraction in the Powder River (PR) Basin of Wyoming and Montana produces modestly saline-sodic wastewater, which may have electrical conductivity (EC) and sodium adsorption ratios (SAR) exceeding accepted thresholds for irrigation (EC = 3 dS m?1, SAR = 12 (mmolc l?1)1/2. As an approach to managing large volumes of CBNG-produced water, treatment processes have been developed to adjust produced water salinity and sodicity to published irrigation guidelines and legislated in-stream standards. The objective of this laboratory study was to assess acute and chronic soil solution EC and SAR responses to various wetting regimes simulating repeated flood irrigation with treated CBNG product water, followed by single rainfall events. Fifty-four soil samples from irrigated fields in southeast Montana were subjected to simulated PR water or CBNG water treated to EC and SAR values accepted as thresholds for designation of saline × sodic water, in a single wetting event, five wetting–drying events, or five wetting–drying events, followed by leaching with distilled water. Resultant saturated paste extract EC (ECe) and SAR of soils having <33% clay did not differ from one another, but resulting ECe and SAR were all less than those for soil having >33% clay. Repeated wetting with PR water having EC of 1.56 dS m?1 and SAR of 4.54 led to SAR <12, but brought ECe near 3 dS m?1. Repeated wetting with water having salinity = 3.12 dS m?1 and SAR = 13.09 led to ECe >3 dS m?1 and SAR near 12. Subsequent inundation and drainage with distilled water, simulating rainfall-quality leaching, reduced ECe and SAR more often in coarse-textured, high salt content soils than in finer-textured, lower salt content soils. Decreases in ECe upon leaching with distilled water were of greater magnitude than corresponding decreases in SAR, reinforcing supposition of sodium-induced dispersion of fine-textured soils as a consequence of rainfall following irrigation with water having salinity and sodicity levels equal to previously published thresholds.
机译：怀俄明州和蒙大拿州的粉河（PR）盆地中的煤层天然气（CBNG）提取产生适度的盐碱废水，其废水的电导率（EC）和钠吸附率（SAR）超过了可接受的灌溉阈值（EC = 3 dS m？1 ，SAR = 12（mmolc l？1 ）1/2 。作为处理大量CBNG生产水的一种方法，处理工艺已经开发出用于调整采出水盐度和盐度以适应已发布的灌溉准则和法律法规的流水标准，本实验室研究的目的是评估模拟处理过的CBNG的重复洪水灌溉对各种润湿方式的急性和慢性土壤溶液EC和SAR的响应。在蒙大拿州东南部灌溉田的54个土壤样品中，对模拟PR水或CBNG水进行了处理，处理后的EC和SAR值被指定为生理盐水×苏打水的阈值。一个浸湿事件，五个浸湿干燥事件或五个浸湿干燥事件，然后用蒸馏水浸出。粘土含量小于33％的土壤的饱和糊状提取物EC（ECe）和SAR互不相同，但是粘土含量大于33％的土壤的ECe和SAR均小于后者。 EC值为1.56 dS m？1 和SAR为4.54的PR水反复润湿导致SAR <12，但ECe接近3 dS m？1 。用盐度= 3.12 dS m？1 和SAR = 13.09的水反复润湿导致ECe> 3 dS m？1 和SAR在12附近。随后用蒸馏水淹没和排水，模拟降雨质量与高质地低盐含量土壤相比，高质地高盐含量土壤更容易浸出，降低ECe和SAR。用蒸馏水浸出后ECe的下降幅度大于SAR的相应下降幅度，这是由于用盐度和碱度等于先前公布的阈值的水灌溉后降雨造成的钠致细结构土壤的分散性的加剧。

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  • 来源
    《Irrigation Science》 |2008年第2期|121-130|共10页
  • 作者

    James W. Bauder; Kimberly R. Hershberger; Linzy S. Browning;

  • 作者单位

    Department of Land Resources and Environmental Sciences Montana State University-Bozeman PO Box 173120 Bozeman MT 59717-3120 USA;

    Department of Land Resources and Environmental Sciences Montana State University-Bozeman PO Box 173120 Bozeman MT 59717-3120 USA;

    Department of Land Resources and Environmental Sciences Montana State University-Bozeman PO Box 173120 Bozeman MT 59717-3120 USA;

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